Compilare: user.cpp: In function ‘int main()’: user.cpp:59:11: warning: statement has no effect [-Wunused-value] for (m; m > 0; --m) { ^ user.cpp:61:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (seg.size() >= 2 * rad) { ^ user.cpp: In function ‘void next_char()’: user.cpp:17:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, BUFF_SIZE, fin); ^